TWO saucy lovers topped off a night at a Pizza Express when it shut - by having sex unaware passers-by were gawping.

The passionate pair were so overcome by lust they FORGOT they could be seen through the window of the brightly-lit eaterie. Laughing crowds gathered outside - with many grabbing their camera phones to take snaps. One Manchester reveller told how he and his mates had earlier spotted the pair snogging. The witness grinned: "We just assumed it was a couple of the staff who'd got carried away. "We popped into a club, then later walked past the same restaurant. Things had hotted up. "The fella had his trousers round his ankles. Everyone was gobsmacked."The whole place was brightly lit and we had a great view. There was an empty bottle of wine and two glasses on a table." A shocked Pizza Express spokesman said: "We are obviously taking this seriously and looking into the matter immediately."